ASN Wikibase Occurrence # 343156
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| Date: | Friday 29 June 2012 |
| Time: | 12:54 |
| Type: |  Bell 412EP |
| Owner/operator: | Chubu Regional Bureau, opb Nakanihon Air Service |
| Registration: | JA6817 |
| MSN: | 36277 |
| Year of manufacture: | 2001 |
| Fatalities: | Fatalities: 0 / Occupants: 8 |
| Aircraft damage: | Minor |
| Category: | Accident |
| Location: | Kawanehoncho, Shizuoka -
 Japan
|
| Phase: | Landing |
| Nature: | |
| Departure airport: | Shizuoka Heliport |
| Nagashima Helipad | |
| Investigating agency: | JTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
A Bell 412EP, registered JA6817, owned by Chubu Regional Bureau, Ministry of Land, Infrastructure, Transport and Tourism (operated by contracted Nakanihon Air Service) experienced a hard landing when attempting to land at upstream of Nagashima Dam temporary helipad. The pilot suffered serious injuries, and one of the passengers suffered minor injuries.
There were eight persons on board, consisting of the pilot, two crews and five passengers. The helicopter was slightly damaged, but there was no outbreak of fire.
Probable Causes
In this accident, it is highly probable that the injuries suffered by the pilot were a result of the hard landing experienced when attempting to land.
It is probable that the cause of the hard landing was that during a high descent rate, the helicopter’s forward airspeed continued to decrease, causing its downwash to produce large vortices wrapping around the upper surface of the main rotor tip and resulting in a vortex ring state. It is probable that because of this, even if the collective pitch lever was pulled, a corresponding amount of lift could not be generated and it was not possible to decrease the Helicopter’s rate of descent.
It is probable that the Helicopter’s forward airspeed continued to decrease during its high descent rate because it was attempting to land on steep approach path under tailwind conditions.
Accident investigation:
 |
|
Sources:
JTSB
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 03-Aug-2023 16:46 | harro | Updated |
Corrections or additions? ... Edit this accident description
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